This was confirmed to ABS-CBN News by Gadon and House of Representatives Secretary General Cesar Pareja. The endorsement paves the way for the impeachment process against Sereno to begin.

"As of 6:30 tonight my complaint against CJ Sereno for impeachment has been received by the HoR Office of the SecGen. In so short a time we gathered 25 endorsers and tomorrow more endorsers will sign," Gadon told reporters.

In his complaint, Gadon alleged that Sereno failed to make truthful declarations in her statement of assets, liabilities, and net worth or SALN—the same allegation that got her predecessor, the late former Chief Justice Renato Corona, ousted from office.

He also accused Sereno of alleged falsification of Supreme Court documents; delayed action on the petitions for retirement benefits of justices, judges and the surviving spouses of deceased justices and judges; alleged manipulation and delay in resolving the request of the Secretary of Justice to transfer the Maute cases outside of Mindanao; and alleged manipulation of the shortlist of the Judicial and Bar Council among others.

Gadon also accused Sereno of corruption over the alleged use of judiciary funds in the purchase of a new vehicle amounting to more than P5 million; alleged use of public funds to stay in expensive hotels when attending local and foreign conferences; flying on business or first class with her staff and security; and bringing a huge entourage of lawyers in her official foreign trips.

Last week, President Rodrigo Duterte spoke of an official outside the executive department who had lavish travels overseas. Asked about the President's remarks, Sereno said she did not feel alluded to, adding that she has "lived a life of modesty."

Gadon also made other accusations against Sereno, including alleged obstruction of justice by ordering Muntinlupa judges not to issue warrants of arrest against the now detained Sen. Leila De Lima; alleged failure to report her attorney’s fees and to pay the appropriate taxes; and alleged embellishment of her personal data sheet.

Sereno has yet to release a statement, as of this posting. -- with a report from Robert Mano, ABS-CBN News